public async Task <TokenResultDto> Prepare(ClaimsIdentity identity, string username)
{
try
{
var now = DateTime.UtcNow;
/* Specifically add the jti (nonce), iat (issued timestamp), and sub (subject/user) claims.
* You can add other claims here, if you want: */
var claims = identity.Claims?.ToList() ?? new List <Claim>();
claims.AddRange(new[]
{
new Claim(JwtRegisteredClaimNames.Sub, username),
new Claim(JwtRegisteredClaimNames.Jti, await _options.NonceGenerator()),
new Claim(JwtRegisteredClaimNames.Iat, JwtHelper.ToUnixEpochDate(now).ToString(), ClaimValueTypes.Integer64),
});
// Create the JWT and write it to a string
var jwt = new JwtSecurityToken(
issuer: _options.Issuer,
audience: _options.Audience,
claims: claims.ToArray(),
notBefore: now,
expires: now.Add(_options.Expiration),
signingCredentials: _options.SigningCredentials);
var encodedJwt = new JwtSecurityTokenHandler().WriteToken(jwt);
var response = new TokenResultDto
{
Token = encodedJwt,
ExpiresIn = (int)_options.Expiration.TotalSeconds,
};
return(response);
}
catch (Exception ex)
{
_logger.LogError(ex, $"Unable to create JWT token: {ex.Message}");
throw;
}
}
private async Task GenerateToken(HttpContext context)
{
var username = context.Request.Form["username"];
var password = context.Request.Form["password"];
var identity = await _options.IdentityResolver(username, password);
if (identity == null)
{
context.Response.StatusCode = 400;
await context.Response.WriteAsync("Invalid username or password.", new CancellationToken());
return;
}
else
{
TokenResultDto response = await _jwtService.Prepare(identity, username);
// Serialize and return the response
context.Response.ContentType = "application/json";
await context.Response.WriteAsync(JsonConvert.SerializeObject(response, _serializerSettings), new CancellationToken());
}
}